GitHub CI: Run cputest to catch regressions early

.github/workflows/fox32-run-cputest.yml

@@ -0,0 +1,42 @@
+on: [push]
+
+name: run cputest
+
+jobs:
+  fox32-run-cputest:
+    name: Build and test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Download latest fox32rom artifact
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          repo: fox32-arch/fox32rom
+          workflow: fox32rom-unstable.yml
+          workflow_conclusion: success
+
+      - name: Download latest cputest artifact
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          repo: fox32-arch/demos
+          workflow: demos-unstable.yml
+          workflow_conclusion: success
+
+      - name: Move fox32.rom into the root folder
+        run: |
+          mv fox32.rom/ download/
+          cp download/fox32.rom ./fox32.rom
+
+      - name: Install libsdl2-dev and vim
+        run: |
+          sudo apt update
+          sudo apt install -y libsdl2-dev vim
+
+      - name: Build
+        run: make
+
+      - name: Test
+        run: |
+          ./fox32 --headless --rom cputest/cputest.bin | tee cputest.log
+          grep 'All tests passed' cputest.log